Car-seat lock



3 Sheets--Sheen 1,. C. PARHAM.

CAR SEAT LOCK.

(No Model.)

Patented July 26 w ww/nemen 3 Sheets Sheet 2.

`(No Model.)

C. PARHAM.

GAR SEAT LOCK.

Patented July 26 N. PETERS. Phnmniahogmphnr, wnshingmn, D, C.

(No Model.) 3 Sheets-Sheet C'. PARHAM.

GAR SEAT LOCK.

No. 367,057. Patented July 26, 1887.

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fwifneaaea nventav UNITED STATES PATENT OEEICEo CHARLES PARHAM, OF PHILADELPHIA, PENNSYLVANIA.

CAR-SEAT LOCK.

SPECIFICATION forming Dart of Letters Patent No. 367,057I dated July 26, 1887.

(No model.)

T0 all whom, it may concern,.-

Be it known that I, CHARLEs PARHAM, a citizen of the United States, residing in the City and County of Philadelphia, and State of Pennsylvania, have invented an Improvement in Car Seat Locks, of which the following isa specification.

My invention relates generally to such car seats as are constructed wit-h shifting or reversible backs, and particularly to the mechanism by which the said backs are attached to the frame-work of the seats and by virtue of which they are constituted reversible or capable of transposition from one side of the seat to the other.

The object of myinvention is the provision, in connection with the back-arms of a car seat, upon and by which arms the back is so mounted as to be capable of two adjustments or movements, namely, rst, a movement bodily from one side of theseat to the other; and, second, a limited tilting movement upon and with reference to the arms t.hemselves,-of a compact positively operated locking device by which such back may be locked in position and held xedly from movement in either ofits saidadjustments,-and by which also, at a single manipulation of the operating key, it Will be unlocked and made free for adjustmentin both respects.

ln'the accompanying drawings, Figure 1 is a view in side elevation of the operative parts of my invention, the plate G being removed,- the bolt and bolt slot being shown in dotted lines,-and two positions ofthe back plate being shown by full and dotted lines respectively. Fig. 2 is a sectional view of the parts represented in Fig. l. Fig. 3 is aviewin side elevation of my improvement, applied to the end frameof the car seat, different adj ustmen ts being shown therein in dotted lines. Fig. 4 is a perspective fragmentary detail view of the back arm, applied bolt, and bracket. Fig. is a detail elevation of the bracket, applicable to the end frame-work of the seat. Fig. 6 is a perspective view of the back casting. Fig. 7

is a perspective View of the inner face of the v plate G. Fig. Sis a perspective view of the key, key block, and cam. Fig. 9 is avfragmentary sectional view of the parts shown in Fig. 2,-the key being removed.

Similar lcttersof reference indicate corresponding parts.

In the drawings, A is the baek'arm of a car seat back, pivoted or secured' to the end frame work of the seat iu any ordinary manner, as by the pivot bolt a represented. The outer or free end of this arm is formed into a skeleton disk or ring B.

Brackets, designated in the drawings by ax, are secured to the end framework of the seat, one on either side of the pivot bolt a, and in suitable position to support the arm A which is taken into thatbracket which is on the side of the seat upon which the back at the time happens to be. The upper outer edge of each bracket is rounded or beveled as shown at a', aud each bracket is provided with a bolt slot or seat, a?.

C is a bolt mounted upon and carried by the arm A, located upon that side thereof which faces the seat frame-work to which said arm is attached, and adapted to be moved end vfor end in its slide bearings.

D is what I term the bolt collar, of the form represented in the drawings, located within the skeleton disk B, and mounted u pon or connected with the outer end or shank of the bolt C.

In the construction of my invention it is desirable that the bolt and bolt collar should al Ways be resiliently held in to their utmost limit toward the bolt slot. I ud it convenient to so hold them by means of the spring plate E, held in niches e @formed in the skeleton disk, and in proper position to bear against the outer end of the bolt collar. I provide the outer endof the bolt collar with a small bearing stud c, against which the plate E may bear.

Vhen the arm-A, therefore, is, in the shifting of the back, brought into one ot" its brackets cox, the end ofthe bolt O will impinge against the beveled surface a', and the stress of the spring plate E be overcome; and when said bolt arrives at a point opposite to the bolt seat a2, it will, by said spring, be shot there into, and the back be thereby looked in position.

F is a back-plate, formed of metal, and attached by suitable arms f to the back. This plate has a discular member, f provided with a wall, f2, at a right angle to its plane, and eX- tending around said discular member for about IOD three quarters of its circumference, the region of the discular member in' which the wall opening, which I designate f3, is thus left, being that farthest from the arms f. This back plate is proportioned to tit upon and around the skeleton disk B and form therewith a hinge joint, and its wall opening is provided to permit of the necessary throw of the arm A, in cdent to the adjustment of the back in respect to the seat, when the back is shifted from one side of the seat to the other. is, when not locked, capable of a rocking, or rotatively sliding movement upon the skeleton disk, which constitutes them together a hingejoint as stated-the extent of their hinge movement is, however, limited and determined by the length of the wall openingfa.

G is a plate adapted to be secured upon the top of the `wall f'l of the back plate "F, and maintain in proper relationship to each other the parts of the hinge joint above' described as well as other devices which will be hereinafter referred to.

Upon the inner tlat face of the discular part f of the back plate is a projection or stud f4,

' located opposite the center of the wall opening j"3 and at'such point that when said back plate is in place upon the skeleton disk B said stud ft'lies within the circumference of the same.

The bolt collar D has a stop block d', to which, incidentally, the bolt C is attached, and, in theinner circumference of the ring B is a shallow seat d2 in which the said stop block, under the stress of the spring plate E acting against the bolt collar D, is seated.

The operation of the devices already described is as follows: The back, when in position, forms an obtuse angle with the plane of the surface of the seat. When the back is shifted to the other side of-the seat it should be readjusted in respect to the plane of the seat, so as to, in its changed position, be at an obtuse angle therewith. Through the instru mentality of the devices described, the back-is locked rigidly in cithcr'of its adjusted posi-l tions with respect tothe back arm, that is, it is prevented from moving in one direction by the end of the wall]c2 in contact therewith, and is prevented from tiltingl in the other direction by the stud ft. The back-arpa, in re- 'spect to the seat, is locked in position by the bolt C which, as stated, engages in the slot a2 of the carrier bracket at. To shift the back from one side of the seat to the other, and also to alter the adjustment of the back and back arm with reference to each other, the bolt collar must be retracted, and the stress of the spring plate E be overcome, whereby the bolt C is'withdrawn from the slot a2, and the stop block d withdrawn from contact with the stud f 4. The back is then tilted until the other end ofthe wall]F2 comes into contact with the edge.

of the back arm, whereupon the bolt collar is released, and the stop block reente'rs its seat di now at the opposite side of the stud f4,-the hinge joint members are thus locked in their The back plateH new position. The back is then thrown to the other side of the seat, its-bolt deflected by the beveled surface a of the metal bracket aX and by the spring plate E sprung into the slot ai, This retraction of the bolt collar, which i in the mounting of the parts is housed between the members of the hinge joint, is effected through theinstrumentality of the following device: Within the said collar, and in jux-V taposition to that face of the same which I designate d3 and term the acting face,is mounted a cam II having two wings or crests. One end of the cam is cylindrical, and forms an arbor or axle h, which, when the plate G is in position, is entered into a suitable bearing or seat g in the inner face thereof. In the end of the arbor h` is formed a small square edged recess hx. The body of the cam H is cylindrically hollow. Thelower or inner end of the shell or body of the cam is pierced by two small orifices ho, on the same radial line, one of which orifices opens exteriorly into the recess hf In the inner face of the plate Gis formed a narrow channel or groove, gx,one

end of said groove extending into vand lying within the seat g. Within, and of about'the same length as, the channel gX is fitted a spring plate g", one end of which, thus brought within the seat g, is turned outward so as, when the arbor is seated in a certain position in its bearing, to engage with the recess hX of the arbor h of the cam H. j

Accurately fitting into, lling, and projecting above the said hollow interior of the cam H, is what I terni a key block I, having a key slot t through the same from end to end and extending to its circumference. The outer end of said key block is of smaller diameter than its body, and extends, when the parts IOC are in position, through an oriice,f5, in the rangement of the parts,fheld securely against manipulation or turning. In `order to turn thevcam to bring one of its wings against the acting face of, and to retract, they bolt collar, it

is necessary to press the spring plateo g" down out of the recess h and into its own groove or channel gx. the operative rotation of the cam, I employ a key L, of substantially the outline represented in the drawings,-the operation of which is as followsz-The key slot of the key block, when the latter is rotated to bring thev slot into its position of registry with the niche f6 in the orifice f 5, is in position directly over, and leads the key, when entered therein, directly to the two orifices h" in the base of the cam. The key is provided with two end prongs t Z which enter said orifices ho, the outer prongy To effect this depression and V encountering, and, in its longitudinal thrust, depressing out of the recess hX the spring plate g". The cam is then free to be rotated, and the key, (the side of which is provided with a slot Z which takes in the edge of the plate surrounding the orificef5,)-by the engagement of its 'prongs with the orifices ho, being rotated, rotates said cam.

Having thus described my invention, I claim l. In combination with the arms of a car seat, a back, back-arms, each, at one end, pivoted to the respective seat arms, and, at the other end, connected by a hinge joint with the back or with an attachment thereto, a locking device attached to one of said back arms and adapted to be operated to lock said back arm with the seat arm or with an attachment thereto, as specified.

2. In combination with the arms of a ear seat, a back, back-arms, each, at one end, pivoted to the respective seat arms, and7 at the other end, connected by a hinge joint with the back or with an attachment thereto, a locking device attached to one of said back-arms and adapted to be operated to lock said back arm with the seat arm or with an attachment thereto, and to simultaneously lock said back arm, with the back, as specified.

3. In combination with the arms of a car seat, a baclz,baclaiins, each, at one end, pivoted to the respective seat arms, and, at the other end, connected by ahinge joint with the back or with au attachment thereto, alocking device attached to one of said back arms and adapted to be operated to lock said back arm with the seat arm and lock said back arm with the back,and adapted to bc operated to simultaneously unlock said parts, as specified.

4. In combination with the arms ofa earseat, a back, back-arms, each, at one end, pivoted to the middle of the respective seat arms, and, at the other end, connected by a hinge joint with the back or with an attachment thereto, and adapted to be operated to swing said back to either before orbehind said seat,alocking device attached to one of said back arms and adapted to automatically operate to simultaneously lock said back-arm with the back or with an attachment thereto, and to lock said back-arm with the seat or with an attachment thereto, and adapted to he operated to simultaneously unlock said devices, and permitsaid back arm to be thrown to swing the back to the other side of the seat, and to permit the back to be angularly adjustedin respect to the back arm, as specified.

5. In combination with a car seat, a reversible back, a back-arm upon which said back is mounted, a bracket attached to the seat frame for supporting said back-arm, a stop attached to the back,-a connected bolt and stop-block mounted upon said back-arm and controlled by a spring, said bolt being adapted to be cntered in a slot in said bracket, and said stop block being adapted to be engaged against said stop, substantially as set forth.

6. In a car seat, a reversible back mounted upon arms adjustable with reference to the back to the seat, in combination with a springcontrolled locking device adapted to effect the locking together of the back arm and back and back-arm and seat arm, in both said adjustments, and the unlocking of the saine at a single operation,--a bolt collar attached to said locking device, and a cam adapted to operate against thc inner face ot' said collar and unlock said lock, substantially as set forth.

7. In a car seat, a reversible back lnounted upon back arms, and adjustable with reference thereto, and in combination with aspringcontrolled locking device adapted to effect the locking together of the back arm and back and back-arm and seat arm, in both said adjustments, or the unlocking ofthe same, at a single operation,-a bolt-collar attached to said locking device, a cam adapted to operate against the inner face of said collar and unlock the said lock, and aspring adapted to engage in a recess in said cam, substantially as set forth.

8. In a device of the class hereinbeforc recited, as a means for operating the sliding boltcollar,-a hollow cam provided with a recess in its base, a spring plate, a key block filling said hollow cam and provided with a key slot, entrance to or exit from which by the key may be effected only when the key slot of the key block is in registry with a slot in the margin of the orifice of the casing in which the same is mounted, and when said key slot is directly over the key orifice in the cam, as specified.

-In testimony whereof I have hereunto signed my name this 5th day of May, A. D. 1887.

GHAS. PARHAM. In presence of Wir. C. STRAWBRIDGE, J. BoNsALL TAYLOR.

IOO 

